Numel locations — where to catch

In Lumiose City (Legends: Z-A)

• Wild Zone 8 — Walk

In Paldea (Scarlet & Violet)

• Asado Desert — Walk
• West Province (Area One) — Walk
• West Province (Area Three) — Walk

In Blueberry Academy (Scarlet & Violet – The Indigo Disk)

• Coastal Biome — Walk
• Polar Biome — Walk

In Sinnoh (Diamond, Pearl & Platinum)

• Route 227 — Walk
• Stark Mountain — Walk

In Johto & Kanto (HeartGold & SoulSilver)

• Ilex Forest — Walk
• Viridian Forest — Walk

In Hoenn (Ruby, Sapphire & Emerald)

• Fiery Path — Walk
• Jagged Pass — Walk
• Route 112 — Walk

Other games (4)

• Brilliant Diamond / Shining Pearl (Gen 8): Route 227, Stark Mountain
• Omega Ruby / Alpha Sapphire (Gen 6): Fiery Path, Hoenn Route 112, Jagged Pass
• Black 2 / White 2 (Gen 5): Reversal Mountain
• XD (Gen 3): Cipher Lab

Numel — full Pokédex entry